C3 Bonnet Adjustment question

[Ringmaster]

Folks,

Twenty seven years ago my C3 had a new offside front wing fitted and the front edge of the bonnet is slightly proud of the wing (barely noticeable).

Consequently, the front offside corner of the bonnet had a tendency to pop up now and again. After some fettling of what looks like a hexagonal shaped adjuster at the base of the offside bonnet spring, this stopped.

However, the more I turn this to bring the bonnet down, the greater the bonnet's desire to start popping open again.

Am I doing something wrong? Any tips appreciated.